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perfidy noun

  /ˈpɜː.fɪ.di/ , /ˈpɝ.fɪ.di/
  • A state or act of violating faith or allegiance; violation of a promise or vow, or of trust.
 perfidia
  • (international law, in warfare) An illegitimate act of deception, such as using symbols like the Red Cross or white flag in a false claim of surrender to gain proximity to an enemy for purposes of attack.
 tradimento

perfidious adjective

  /pəˈfɪdi.əs/ , /pɚˈfɪdi.əs/
  • Of, pertaining to, or representing perfidy; disloyal to what should command one's fidelity or allegiance. [from late 16th c.]
 perfido

perfidiously adverb

  • In a perfidious manner.
 perfido
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